Facebook stock is taking a huge hit as the social media company takes heat for the use of its data by the outside firm Cambridge Analytica. Approximately 50 million Facebook users were affected by the breach. Yahoo Finance's Seana Smith, Dan Howley, Andy Serwer, and Myles Udland discuss the company's latest problems.

The move came as U.S. and European lawmakers demanded an explanation of how the consulting firm, which worked on President Donald Trump's election campaign, gained access to the data. In the U.S., members of Congress called on Facebook CEO Mark Zuckerberg to testify about Facebook's actions. Facebook said on Monday it had hired forensic auditors from the firm Stroz Friedberg to investigate and determine whether Cambridge Analytica still had the data.

For Qualcomm CEO Steve Mollenkopf, having fended off an unwanted takeover from Broadcom just leaves more headaches, from customer disputes to unhappy shareholders to a long-shot takeover bid from his former ...

Once more, the evidence mounts that Tim Cook and Apple seriously underestimated the appeal of the iPhone X, with ambitious orders for Q1 2018 having to be rowed back and analyst projections for Q2 and Q3 are being downgraded.

Saudi Arabia called the 2015 nuclear deal between Iran and world powers a "flawed agreement" on Monday, on the eve of a meeting between the Saudi crown prince and U.S. President Donald Trump who have both been highly critical of Iran. "Our view of the nuclear deal is that it's a flawed agreement," Saudi Foreign Minister Adel al-Jubeir told reporters in Washington.